For the first time, Hyundai Motor Company has approved the use of E15 in MY 2017 Hyundai and Kia vehicles, joining the majority of its auto competitors. Together, Hyundai and Kia represent slightly more than 8 percent of the U.S. light-duty automobile market.

In 2012, EPA approved the use of E15 in vehicles built in MY 2001 or later. However, auto manufacturers did not retroactively endorse the use of E15 in legacy vehicles that were already on the road.